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Preparation method of defoaming agent

A defoamer, stirring and mixing technology, applied in the field of defoamer preparation, can solve the problems of acid and alkali resistance, high temperature resistance, etc., achieve low surface tension, strong defoaming effect, and increase hydrophilicity

Inactive Publication Date: 2018-07-24
朱东洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of a defoamer in view of the problems that the current silicone defoamer has good defoaming performance and anti-foaming foam production performance, but it is not resistant to high temperature and acid and alkali

Method used

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Examples

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Effect test

preparation example Construction

[0018] A kind of preparation method of antifoaming agent, comprises the steps:

[0019] (1) In terms of parts by mass, take 40~45 parts of cetyl alcohol, 45~50 parts of α-methacrylic acid, 1.5~1.8 parts of p-toluenesulfonic acid, 0.9~1.2 parts of hydroquinone, and heat up to 120~ Stir and mix at 130°C for 5~6h to obtain a mixture. Take the mixture and add dichloromethane at a mass ratio of 1:2, adjust the pH to 7~7.5, let it stand, take the lower layer liquid, and then add a mass fraction of 9~12 times the mass of the lower layer liquid Be 36% sodium chloride solution, rotary evaporation, obtain rotary evaporation;

[0020] (2) Take hydrogen-containing silicone oil and add toluene and hydroquinone according to the mass ratio of 50~60:30~40:0.1~0.3, stir and mix at 45~50°C for 20~30min, then add 3~5% of hydrogen-containing silicone oil Chloroplatinic acid, heat up to 85~90°C and keep warm for 1~2h to obtain the mixed solution. In terms of parts by mass, take 20~30 parts of the...

Embodiment 1

[0024] Allyl alcohol polyoxyethylene polyoxypropylene ether: purchased from Jiangsu Haian Petrochemical Plant.

[0025] Hydrophobic white carbon black: purchased from Shanghai Yuejiang Titanium Chemical Products Co., Ltd., with a specific surface area of ​​95m 2 / g.

[0026] A kind of preparation method of antifoaming agent, comprises the steps:

[0027] (1) In terms of parts by mass, take 40 parts of cetyl alcohol, 45 parts of α-methacrylic acid, 1.5 parts of p-toluenesulfonic acid, and 0.9 parts of hydroquinone, heat up to 120°C and stir and mix for 5 hours to obtain the mixture. Add dichloromethane to the mixture at a mass ratio of 1:2, adjust the pH to 7, let it stand still, take the lower layer liquid, and then add a sodium chloride solution with a mass fraction of 9 times the mass fraction of the lower layer liquid with a mass fraction of 36%, and rotate to evaporate to obtain a rotary evaporator ;

[0028] (2) Take hydrogen-containing silicone oil, add toluene and hy...

Embodiment 2

[0032] Allyl alcohol polyoxyethylene polyoxypropylene ether: purchased from Jiangsu Haian Petrochemical Plant.

[0033] Hydrophobic white carbon black: purchased from Shanghai Yuejiang Titanium Chemical Products Co., Ltd., with a specific surface area of ​​100m 2 / g.

[0034] A kind of preparation method of antifoaming agent, comprises the steps:

[0035](1) In terms of parts by mass, take 45 parts of cetyl alcohol, 50 parts of α-methacrylic acid, 1.8 parts of p-toluenesulfonic acid, and 1.2 parts of hydroquinone, heat up to 130°C and stir and mix for 6 hours to obtain the mixture. Add dichloromethane to the mixture at a mass ratio of 1:2, adjust the pH to 7.5, let it stand, take the lower layer liquid, then add a sodium chloride solution with a mass fraction of 36% that is 12 times the mass of the lower layer liquid, and rotate to evaporate to obtain a rotary evaporator ;

[0036] (2) Take hydrogen-containing silicone oil and add toluene and hydroquinone at a mass ratio of...

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Abstract

The invention discloses a preparation method of a defoaming agent and belongs to the field of defoaming agents. According to the preparation method of the defoaming agent, disclosed by the invention,ethyl orthosilicate is taken as a raw material to prepare nano-silica, however, because ethyl orthosilicate has abundant hydrophilic group-OH which is easy to aggregate under the action of a large amount of hydrogen bonds, the stability of the defoaming agent is reduced; polydimethylsiloxane is loaded on the nano silica, so that the problem that the nano-silica is easy to aggregate can be solved,dispersion and viscosity enhancement of main components in the defoaming agent are enhanced by polydimethylsiloxane when being in the defoaming agent and the emulsification effect is improved; by adding hydrophobic white carbon black, the compatibility of hydrophobic white carbon black and an organic phase and the dispersibility of the hydrophobic white carbon black are improved, rapid dispersionof dimethyl silicone oil in a foaming system is facilitated, and thereby stability enhancement and defoaming and foam inhibiting performance of the whole defoaming agent system are promoted.

Description

technical field [0001] The invention belongs to the field of defoamers, in particular to a preparation method of defoamers. Background technique [0002] With the rapid development of science and technology, industries involving stirring will be accompanied by the generation of foam, such as papermaking, ink, paint, fermentation, printing and dyeing and other industries. Foam is a coarse dispersed phase of gas in liquid. On the one hand, it will greatly limit industrial production capacity; on the other hand, it will cause waste of raw materials and products, and affect the quality and performance of products. The industry usually chooses to add a defoamer to the reaction system to eliminate and suppress the generation of foam. The function of defoamer is divided into defoaming and foam suppression. After the foam is generated, when the defoamer touches the foam, it immediately reacts with the hydrophobic segment molecules on the foam surface to form a double film layer. ...

Claims

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Application Information

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IPC IPC(8): B01D19/04
CPCB01D19/0404B01D19/0409
Inventor 朱东洋庄文琴刘红妹
Owner 朱东洋
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